JPS60617A - Magnetic head assembly - Google Patents

Abstract

PURPOSE:To reduce remarkably noise mixed externally on a read signal obtained from a magnetic head by providing a read amplification integrated circuit to a side face of a head slider holding the magnetic head so as to reduce considerably the length of an interconnecting wire for them. CONSTITUTION:A thin film magnetic head 6 is formed on a side face 19 of the magnetic head slider 18 and arranged, and a lead pattern 20 connected to a head coil 11 is formed and placed. The lead pattern 20 of the thin magnetic head 6 is connected to a bonding pad corresponding to input termianls P4, P5 of an IC chip of the read amplification integrated circuit 10 via bonding wires 21, 21'. Thus, the length of the wiring from the head coil of the thin film magnetic head 6 to the input terminals P4, P5 of the read amplification integrated circuit 10 is reduced extremely in comparison with the length of wiring of a conventional magnetic head assembly.

Description

[Detailed Description of the Invention] The present invention provides a method for writing data to a magnetic recording medium or (
(2) A magnetic head slider assembly which holds a magnetic head for extracting data from the same medium and floats over the medium while keeping a slight gap therebetween is connected to the magnetic head slider assembly.

Generally, in order to read out data previously written on a magnetic recording medium, it is necessary to faithfully detect and amplify the bladder output signal blood pressure generated in the head coil of the magnetic head.

Recent death, signs 1. As the recording density of stored data and the performance of the device 1'a improve, various improvements have been made to write and read data (to improve i-axis performance). Conventionally, in order to embed data into a magnetic medium (-1), one incision cycle h'ν is used to supply the Iwakomi value number bIC to the magnetic head, and in order to extract data from the same medium to n. The readout circuit &'j:, which amplifies the readout pressure obtained from the magnetic head, was used independently.

Recent (1st memory storage fil: i dege, data n12
Along with the improvement in the density of blades, improvements have been made in each operation of 1 convolution and IIT extraction (4f) to improve the reliability (4).

Conventionally, a circuit including the above data ψ and F and an amplifier circuit that outputs i and 1 are used.

Each was prepared independently. However, in recent years i, 6q
11F mixed into the bladder ejection signal detected from the air head
1 amount of low '041. The purpose was to Dexy 1 included ViS and anti-exit amplifier circuit, head selection circuit, write and zt output mode switching circuit, abnormality detection amount #'r+
Add temple.

Since the appearance of data writing/ff'ii and skewer integrated circuits (hereinafter abbreviated as head ICs), which are integrated circuits, these have been widely used.

FIG. 1 shows an example of a conventional general magnetic head assembly. In this figure, (fusing head assembly tint, arm (2), printed circuit board +31.
It consists of a pair of springs (4) and a magnetic slider assembly (5). Magnetic heads (6) are installed on the sides of each magnetic head slider assembly (January 5).
) is formed and held, and the head slider assembly (5) is attached to the tip of the spring (4). Spring (4) and printed circuit board (3)
) has an arm + 21K extra edition and a fixed awn.

A head IC (7) is attached to and connected to the upper VC of the printed circuit board (3), and a rear moving Vc of this printed circuit board (3) is connected to a connector (81).

As shown in Figure 1, 7i5. r, data writing of head assembly January 1) and 111. The general outline of the unloading operation is as follows. First, in the write mode, write data is supplied from the connector t81, and when this is input to the header C (7), the header C (7)
A rock current is generated from the internal circuit. What 6. The head coil (not shown) of the head (6)' is connected to the printed circuit board +311C via a well-known glue bond, and the above-mentioned intellect current is connected to the printed circuit board (3) and the above-mentioned lead wire. flows to the above head coil, and the data'@
(Includes TI.

On the other hand, in *'nfj output mode, the data written into the air medium is detected by the magnetic head (6).

W/c output M'1i is generated as a pressure in the head coil. This bladder outlet pressure No. 8' is inputted to the head IC (71) via the lead wire, and is input to the head IC (71) through the lead wire.
7) The bladder output amplification circuit installed in the inner carpet increases the
6.

It is sent to the subsequent read signal processing circuit via connector +81.

Here, the readout signal detected from the 1% air head (6) is connected to the distribution path 9'' until it is input to the head 1C (71).
f:.

This is the sum of the lead wire and the wiring pattern length of the printed circuit board (3). This magnetic head (6) and head E-C (7)
) The wiring song between A and A is susceptible to interference from the outside, so it is kept as short as possible.

Conventionally, in magnetic storage devices such as ei disk devices.

Magnetic heads using ferrite cores were widely used. The number of turns of the head coil of this ferrite type ferrite head is usually 20 to 3 turns. In contrast, head cores and head coils have recently been formed from metal magnetic materials. So-called thin film magnetic heads have appeared and become widely used.

In this thin-film magnetic head, the number of windings of the head coil is several turns or more than ten turns due to constraints on finger construction, which is approximately 1/3 to 1/2 of that of a ferrite head. Therefore, the amplitude of the readout (7 signal pressure) detected by the thin film 1-section head is 1/3 to 1/2 that of the ferrite head when the head gap width is the same.
decreases to . Therefore, in order to obtain a signal-to-noise ratio equivalent to the read signal of a ferrite head using a thin-film magnetic head, the noise level must be reduced by the same rate as the signal voltage amplitude is reduced. but.

Lead wires and a printed circuit board (as shown in Figure 1)
3) Using (unable to reduce the influence of external kiI that the wiring between the magnetic head (6) and the head eC (7) receives in the head assembly C)
/ Drinking (Continuous output 4i when configured using yki head =
This will deteriorate the ratio of No. (M) to miscellaneous soup.

This invention eliminates the above-mentioned conventional drawbacks, shortens the wiring path between the head IC's successive amplifier circuit and the magnetic head as much as possible, and allows the read amplifier circuit to be placed θ in the immediate vicinity of the head coil. , the head coil of the head slider that holds the head is placed similar to the above j%1-width circuit IC chip (f). This is what we provide.

An embodiment of the present invention will be described below with reference to the drawings. Second
The figure isometrically shows the offset amplification collection R'tc times r (season ω), where P1 is the positive polarity power supply terminal, p2 is the negative polarity power supply, and ps is the ground terminal.P4 and P5 are respectively These are input terminals for the read signal voltage vh generated by the head coil all.R1, R2, R5゜R4 and R5 are 1
Anti, Q, 1. Q2 and Q3 are transistors,
A differential amplifier is formed by these resistors and transistors.Also.

Q4. Q5. Q6 and Q7 are transistors, R6°R
7, R13 and R9 are resistors, and these transistors and resistors form an emitter follower 47.Y. P 6 'tS ii' + c output bias 1
This is the digit input terminal. Further, B7 and B8 are output terminals of the protruding M-width power ino 1: (-?r Qo) which are constructed by the above-mentioned differential sweeper and emitter follower, respectively.

Next, the operation of the exposed amplifier integrated circuit shown in FIG. 2 will be explained. First, input bias number 48 to the a-output bias signal number 6 input switch.

The entire m-output amplification integrated circuit 0(1) is activated. When the unloading signal 'spiral pressure Vb generated in the externally connected head coil αI) is input to the input terminals P4 and B5, the transistors Q, 1. %-yohi Q2 base Q2
+ and (12'). Transistor Q3
T'! .

Readout signal input to readout signal input terminal P6, ＼
, generates a more constant current than the negative current due to the negative signal.Transistors Q1 and Q2.

The glare signal 'Ni[E Vh inputted to each base Oa and (12) is amplified, and the transistor Q1
-y L/ Lid (1:(l ト4ILJ7i,,
Another amplification Ichikawa-B2 is generated at the collector (13') of the transistor Q2 and the h trace of the resistor R2 at the point (i4'). These Ling f width city pressure v1 and v2&yu,
Each signal is sent to an emitter follower prepared in the next stage. The above amplification 'mFJ21 and B2 &↓ is applied to the bases 0ω and (15') of transistors Q4 and Q5. Here, the transistors Q6-h- and Q7 generate a constant 1↓) flow in e2 and IC3, respectively, due to the bias current caused by the read bias signal.

Due to the amplification effect of transistors Q4 and Q5, the connection point (1'D
and the emitter (16') resistor R7 of transistor Q5.
Amplified II pressure v 5 lines and B4 are connected to the connection point (17') of
f occurs. Above connection point a71 and (17'l&''
The readout voltage vh generated at αυ connected to the output terminals P7 and B8 of the path 0■ is amplified by the readout amplification integrated circuit Q[), Qtll output ゛tunta v.

can be obtained as

FIG. 3 is a diagram showing a magnetic herad slider assembly (5) according to an embodiment of the present invention. In this figure, a thin film magnetic head (6) is formed on the side surface 01 of the slider OQ.
In addition, a drawer pattern (4) connected to the head coil 0υ is formed and arranged (?-). Two head coils ΩB and two drawer patterns are provided, and two head coils are connected to the head coil 0υ. By using only one of the good ones among them, an improvement in yield of 9 is achieved.Furthermore, on this side a9 is an integrated circuit chip (hereinafter referred to as a readout amplification integrated circuit 00).

(abbreviated as "C-chip") is installed.

The general outline of this IC chip 00) is as shown in Figure 4, and symbols B1 to B8 indicate bonding pads, which are terminals P1 to P1 of the bladder amplification integrated circuit αQ shown in Figure 2, respectively. Each corresponds to P8.However, bonding pad B for head coil connection
4. ．． B5 &? , two are provided so that they are also connected to the left and right Herad coils, and both are connected to the terminal p4.
connected to p5. These bonding pads B4 and B5 are attached to the thin film 4Lk head (6) as shown in Figure 3.
) is connected to any one of the lead-out patterns (A) and the bonding wires CJO and (21).

Cables W1 to W8 are connected to all bonding pads B1 to B8 including these bonding pads B4 and I35.
These cables are wired to the W:fA terminals of the printed circuit board (3) as shown in FIG.

Wires are made to 'hj, ground, readout signal processing circuits (not shown), etc. via the iC and connectors on the circuit board. As shown in Figure 3.

? WN (The extraction pattern (a) of the magnetic head (6) is connected to the bonding wires corresponding to the input terminals P4 and B5 of the IC chip of the integrated circuit (Ll) through the bonding wires Qυ and (21'). Pads B4 and B5 are connected to vC.This allows the amplification and concentration circuit to be emitted from the head coil of the thin film magnetic head (6).
f'? The length of the wiring path to the input terminals P4 and B5 of the tl111 is extremely shortened compared to the wiring path of the simple magnetic head assembly shown in FIG.

In the above explanation, an example has been shown in which the IC chip of the readout amplification integrated circuit a1 is arranged on the same surface as the side surface on which the head coil aυ on the head slider side is arranged, but it can also be arranged on the other side surface of the head slider. It's okay.

In the present invention, as described above, since the trajectory amplification integrated circuit is disposed on the side surface of the head slider that holds the magnetic head, the length of the wiring path connecting these components to each other can be extremely shortened. therefore.

Noise mixed in from the outside into the nfU output signal obtained from the 4VI head can be significantly reduced, making it possible to output data with high reliability.

[Brief explanation of the drawing]

Fig. 1 is a plan view of a conventional magnetic head assembly; Fig. 2 is a schematic circuit diagram of a circuit C used in an embodiment of the present invention; A magnetic herad slider assembly showing one embodiment is shown in Fig.
51 kl Magnetic head slider assembly, (6) is the magnetic head, (11 is the readout amplification integrated circuit, al) is the head coil, (1 is the old head slider, flI & j, and its (lj1 side). Agent Large Masu Iwa] 1h (and 2 others) Procedural amendment (voluntary) 1. Indication of the case Patent application No. 107356 No. 107356 1987 2,
Name of the invention: Magnetic spatula 1 assembly 3. Relationship with the person making the amendment: 1.1" Authorization: Representative Makoto Ichi Yamamoto 4, Agent (Contact information: 03.21.3; = I21: :r, :” Part i] 5. Detailed explanation of the invention in the specification subject to amendment 6. Contents of amendment (1) Specification: 5n, line 6 “Magnetic material”] A・σ
} is corrected to "thin film material". (2) Mei 111 A} Page 9, line 20 says “Noku・SohJ
and ノF1) is corrected as ``Bano 1-''. Below 1

Claims (1)

[Claims] In order to read the data previously written on the recording medium, the head coil of the magnetic head detects and amplifies the read signal pressure; the data output amplification integrated circuit 76 holds the magnetic head. head slider n+11
(Magnetic head assembly).